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The Lassetter

Episode 11 - Trash

Re: The Lassetter

Postby Kurtyboy » Tue Jan 03, 2017 5:21 pm

Thanks again. Like I said, I know nothing about electronics so it's another language to me.

I can't find the 25uf capacitors at 10v on ebay at all.

The NPN has these values. Are they okay for this 9v circuit?
Collector-Emitter Voltage:..........40V
Collector-Base Voltage:.............75V
Emitter-Base Voltage:...............6
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Re: The Lassetter

Postby propmaster2000 » Tue Jan 03, 2017 5:36 pm

Hi,

Not sure where you are located, but do you have a Radio Shack near you?
All Electronics is another good source for small quantities.

If you buy of eBay, the quantity will be large.
http://www.ebay.com/sch/i.html?_odkw=np ... 2&_sacat=0

ALL ELECTRONICS is a good hobbyist choice and shipping is quick:

Try looking for a 22uf 16v instead:
(maybe even order a 10uf too)
http://www.allelectronics.com/category/ ... ial/1.html

Also, a 2N4401 NPN small package TO92 will work as well:
http://www.allelectronics.com/item/2n44 ... tor/1.html

They also sell the 1N914 switching diode:
http://www.allelectronics.com/item/1n91 ... ode/1.html

470 ohm, 2.2K and 10K 1/4w resistors can be ordered from them :
http://www.allelectronics.com/category/ ... ors/1.html

as well as look into getting an experimenters solderless breadboard to test your circuit with:

http://www.allelectronics.com/item/pb-4 ... cts/1.html
http://www.allelectronics.com/item/pb-1 ... cts/1.html

.
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Re: The Lassetter

Postby Kurtyboy » Tue Jan 03, 2017 10:01 pm

Phew that's everything ordered, thanks! I'm in the UK.

Once I get the fading LEDs sorted my next challenge will be the 7 segment countdown. I can get an off the shelf counter and drive it with a pulse generator, but it will have to count up instead of down since they all start at zero.

And I'll have to swap the 7 segment displays out for smaller ones so I hope they are interchangeable...


Any idea where the on/off switch is on this thing?
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Re: The Lassetter

Postby propmaster2000 » Wed Jan 04, 2017 2:09 pm

That's good news. :)
Keep us posted on your progress.

By the way, did you order anything from All Electronics?
They always have some cool stuff.

Build Information:
When you get the components, put together the timer first and test it's function.
Then take that output signal from the (timer) clock and drive the NPN through
the Resistor and Diode.
(Don't add the Capacitor just yet.)

Connect the three LEDs to the Collector of the NPN as per the drawing and
make sure that they all have there current limiting resistors.
Wire those resistors to the 9v positive.

Then connect the Emitter of the NPN to ground.
In this setup, all three LEDs will blink at the same time.
You will add your 3 on/off push button switches in series with each of the LEDs.

At this point test your circuit to see that the LEDs do indeed blink.
Adjust your timing for the correct rate.
Now add the capacitor to the Base of the NPN as shown in the
schematic drawing to see how it effects the fade function.

Good Luck! :)
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Re: The Lassetter

Postby Kurtyboy » Wed Jan 04, 2017 3:32 pm

I'll do my best, but as the circuit is already built and working I'll basically just be trying to add the new components in. Thanks again.
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Re: The Lassetter

Postby propmaster2000 » Wed Jan 04, 2017 4:46 pm

Sounds good.

Here is a video link showing a mock-up circuit using the components in place on a breadboard:

https://www.youtube.com/watch?v=JaC8pQNpCf0

Also,
It appears that the main power TOGGLE switch is located on the left side of the body
(read the description in the photo below) and the counter counts down to 000,
starting at 999.

Image

The image and description below is from the recent "PIH" auction:
Image


.
Last edited by propmaster2000 on Wed Jan 04, 2017 10:46 pm, edited 1 time in total.
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Re: The Lassetter

Postby Kurtyboy » Wed Jan 04, 2017 8:57 pm

Aha, there it is! Thanks.

The off the shelf counters don't count below zero unfortunately.
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Re: The Lassetter

Postby Kurtyboy » Wed Jan 04, 2017 9:25 pm

Had a look at your circuit video. Thanks for the layman's explanation!

I should stick with the values you added to my circuit? Or should I change to the new values?

This is the counter that seemed best/smallest. I won't be using the case or separate red/green button board.

https://www.quasarelectronics.co.uk/Ite ... nt-counter

This is the 7 segment display I'm going to try and use. I checked it's the correct common cathode/anode. I plan on cutting the board for the display off and soldering a ribbon cable between them.

http://m.ebay.com/itm/381505814717

I take it they will be compatible as long as the correct pinouts are followed?
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Re: The Lassetter

Postby propmaster2000 » Thu Jan 05, 2017 1:58 pm

I would say that the values of the components depends largely on what you expect to see.
The circuit layout is sound, so the value of the resistors and cap. can be modified during the
build process. That is why I recommended the solderless breadboard.
I used the values in the video because that's what I had on hand.
The output voltage/current from the clock will also be a factor.

On your choice of counter.....will it count down?
It indicates that it is an event counter so you will need a ''clock'' input so it
counts automatically and hopefully counts down.

Are you getting the kit or pre-assembled version?

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Re: The Lassetter

Postby Kurtyboy » Thu Jan 05, 2017 2:04 pm

Yes, I have an external pulse generator for the counter. It does count down but not from zero which is why I'll have to settle for counting up.

Preassembled of course lol! There's no way I'd even attempt to solder that ;)
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